Variable focus liquid lens with reduced driving voltage
US7312929B2 · kind B2 · utility
8Cited by
1References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2006 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Jan 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a variable focus liquid lens using electrowetting, comprising a conductive first liquid and an insulating second liquid. At least one of the first liquid composed of electrolyte and the second liquid composed of insulating liquid contains a surfactant for reducing interfacial energy between the first and second liquids. An interfacial portion between the first and second liquids is gathered by surfactant to reduce driving voltage. The variable focus liquid lens according to the invention has about 50% lower driving voltage required for changing focus, ensuring stability of the two fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.